Circuit Board with wiring harness for whole house fan-powered humidifiers. Includes wiring harness.

Replacement circuit board with transformer for many brands/models of whole house humidifiers. Same as Aprilaire 4238. Board includes relay and transformer that supply 115V to fan motor and 24V to solenoid when system humidistat switch calls.

Bryant humidifier was tripping circuits, so believed circuit board was at fault. Replaced board, but found actual culprit was a short in the the solenoid. Ended up having to replace both. iaqsource was very responsive in filling orders.

This circuit board is a universal replacement for many whole-house power humidifiers. Most humdifiers are made by the same manufacturer.

Label all the wires before removing them from the original circuit board. I reversed the polarity on the 2 humidstat wires and on the 2 wires for the solenoid; it wouldn't work. Good news is that this didn't destroy the circuit board and once corrected, everything worked great.

Bryant humidifier was tripping circuits, so believed circuit board was at fault. Replaced board, but found actual culprit was a short in the the solenoid. Ended up having to replace both. iaqsource was very responsive in filling orders.

This circuit board is a universal replacement for many whole-house power humidifiers. Most humdifiers are made by the same manufacturer.

Label all the wires before removing them from the original circuit board. I reversed the polarity on the 2 humidstat wires and on the 2 wires for the solenoid; it wouldn't work. Good news is that this didn't destroy the circuit board and once corrected, everything worked great.

Circuit Board with wiring harness for whole house fan-powered humidifiers. Includes wiring harness.

Replacement circuit board with transformer for many brands/models of whole house humidifiers. Same as Aprilaire 4238. Board includes relay and transformer that supply 115V to fan motor and 24V to solenoid when system humidistat switch calls.